Data is synced from the Chrome Web Store. View the official store page for the most current information.
PolyChart - Candlestick Charts
Summary: Professional K-line charts for Polymarket prediction markets
See What the Line Chart Hides
You're staring at Polymarket's default chart. A thin blue line wiggles across the screen. The price went up, then down, then up again. That's all you know.
What was the high of the day? No idea. Where did buyers step in? Can't tell. Is this a breakout or a fakeout? The line doesn't say.
PolyChart replaces guesswork with clarity. Professional candlestick charts that show you exactly what happened—every open, high, low, and close. The same visualization that traders have used for centuries to read markets, now available for Polymarket.
The Problem With Line Charts
Line charts connect closing prices. That's it. They throw away three-quarters of the information that matters.
Consider a market that opens at 50¢, crashes to 30¢ on panic selling, then recovers to close at 48¢. The line chart shows a tiny dip. It completely hides the 20-cent intraday range—the volatility, the fear, the recovery. You'd never know the market was briefly available at 30¢.
Now consider the same move on a candlestick chart. You see:
Multiply this across days and weeks of trading. Line charts blur everything into a smooth curve. Candlestick charts preserve the texture of the market—the struggles, the rejections, the breakouts.
Why Candlesticks Matter for Prediction Markets
Prediction markets aren't stocks, but price action is price action. The same human psychology drives both. Fear and greed. Overreaction and correction. Support and resistance.
Candlestick patterns reveal this psychology:
Long Lower Wicks: Sellers pushed hard but buyers absorbed everything. Potential bottom.
Long Upper Wicks: Buyers tried to break through but got rejected. Resistance confirmed.
Small Bodies with Long Wicks: Indecision. Neither side controls the market.
Large Bodies with No Wicks: Conviction. One side dominated completely.
These patterns appear in prediction markets just like traditional markets. A political event creates panic selling—you see it in the wicks. A resolution date approaches—you see compression in the bodies. Whale accumulation—you see it in the price structure.
Line charts hide all of this. They're fine for checking "what's the current price?" They're useless for understanding market dynamics.
What PolyChart Delivers
PolyChart injects professional candlestick charts directly into Polymarket pages. No external sites. No manual data export. Just open a market and see the candles.
Multiple Timeframes
Switch between five different views:
Each timeframe tells a different story. Zoom in for entry timing. Zoom out for trend direction. Professional traders constantly switch between timeframes to build complete market understanding.
Full OHLC Data
Every candle displays four prices:
Hover over any candle to see exact values. The OHLC bar updates in real-time as you move your cursor across the chart.
Professional Chart Controls
PolyChart uses TradingView's Lightweight Charts library—the same technology powering millions of trading interfaces worldwide.
The interface matches Polymarket's dark theme. It feels native, not bolted-on.
Draggable Panel
Position the chart anywhere on screen. Drag the header to move it. Minimize when you need focus. Close when you're done. Your workflow, your layout.
Reading Candlestick Charts
For those new to candlesticks, here's the essential vocabulary:
Candle Body: The thick rectangular part. Represents the range between open and close.
Wicks (Shadows): The thin lines extending above and below the body. Represent the high and low.
Green Candle: Close higher than open. Bullish period.
Red Candle: Close lower than open. Bearish period.
Doji: Tiny body, long wicks. Open and close nearly equal. Market indecision.
A sequence of green candles with higher lows indicates buying pressure. A sequence of red candles with lower highs indicates selling pressure. Wicks tell you where the market rejected prices.
This isn't astrology. It's visual representation of supply and demand. Where did sellers overwhelm buyers? Look at the top of the wicks. Where did buyers step in? Look at the bottom.
Practical Applications
Finding Entry Points
You're bullish on a market trading at 45¢. Should you buy now or wait?
Check the hourly chart. If recent candles show long lower wicks around 42¢, that's potential support. Set a limit order there. If candles show clean bodies with no lower wicks, current prices might be as low as you'll get.
The line chart just shows 45¢. The candlestick chart shows the market's memory—where buyers previously defended.
Identifying Breakouts vs. Fakeouts
The market just spiked from 50¢ to 60¢. Is it real?
Check the candle. Is the body full (close near the high)? That's conviction—buyers holding their gains. Is the body tiny with a massive upper wick? That's rejection—someone sold into the spike.
The line chart shows both scenarios identically. The candlestick chart reveals the truth.
Gauging Volatility
Prediction markets often go quiet, then explode on news. Candlesticks show this pattern clearly.
Small bodies and small wicks: Low volatility, market waiting. Large bodies and large wicks: High volatility, market moving. Transition from small to large: Something happened.
Volatility patterns help you size positions appropriately and set realistic expectations.
Timing Entries Around Events
Major events create predictable patterns. Before a debate, uncertainty compresses ranges. During and after, volatility spikes. Candlesticks let you see these phases clearly and position accordingly.
Why Polymarket Doesn't Have This
Polymarket prioritizes simplicity. Their default interface serves casual users who just want to check prices and place bets. That's a reasonable choice for a mainstream platform.
But simplicity has costs. You lose information. You lose edge. You trade blind while sophisticated participants trade with full visibility.
PolyChart bridges this gap. Keep Polymarket's clean interface for order entry. Add professional charting for analysis. Best of both worlds.
Technical Implementation
PolyChart pulls data directly from Polymarket's public CLOB API. The same data feeds their own charts—we just visualize it differently.
Data Processing:
Chart Rendering:
Performance:
The extension loads only on Polymarket pages. It doesn't run elsewhere. It doesn't slow your browser.
Privacy and Permissions
PolyChart requests minimal permissions:
storage: Saves your preferences (last selected timeframe, panel position).
Host access to clob.polymarket.com: Fetches price history data. Read-only API access to public market data.
Host access to gamma-api.polymarket.com: Fetches market metadata. Same data visible on the Polymarket website.
Host access to polymarket.com: Injects the chart panel into Polymarket pages.
What we don't do:
The extension operates entirely locally. Your trading remains private.
Limitations
Data Availability: Charts show data from Polymarket's API. New markets may have limited history. Very inactive markets may have sparse data points.
Not Real-Time: Price updates when you switch timeframes or refresh, not tick-by-tick. For live price monitoring, use Polymarket's native display.
Single Market View: The panel shows one market at a time—whichever page you're viewing. No multi-market comparison within PolyChart.
Historical Only: Shows past prices. Doesn't predict future prices. Candlesticks are analytical tools, not crystal balls.
Who Benefits Most
Active Traders: If you trade Polymarket frequently, candlesticks provide crucial context for entry and exit decisions.
Technical Analysts: If you use chart patterns and price action in other markets, you'll immediately recognize their value here.
Curious Learners: If you want to understand why markets move, candlesticks reveal the underlying dynamics hidden by line charts.
Risk Managers: If you care about volatility and range, candlesticks display both explicitly.
If you check Polymarket once a week and just want to know who's winning, the default chart is probably fine. If you trade seriously and want every edge available, PolyChart is essential.
Getting Started
No configuration required. No account creation. Just install and trade smarter.
The Information Gap
Markets are competitive. When you trade, someone is on the other side. If they have better information or better tools, they have an edge over you.
Line charts are the lowest common denominator. Everyone sees them. They provide no edge—they're table stakes.
Candlestick charts are standard among serious traders. They've been refined over centuries because they work. They compress maximum information into minimum visual space. They reveal what line charts hide.
You can trade without them. Millions do. But you're leaving information on the table—information that could improve your entries, exits, and overall results.
PolyChart costs nothing except the seconds to install. The upside is better market understanding. The downside is zero.
Built for Traders, By Traders
PolyChart exists because we wanted it ourselves. We trade prediction markets. We got frustrated with line charts. We built something better.
The result is clean, focused, and functional. No bloat. No premium tiers. No data harvesting. Just candlestick charts for Polymarket.
Install PolyChart. See what you've been missing.
PolyChart: Because serious traders deserve serious charts.
Track and analyze Chrome Web Store extensions with comprehensive analytics and insights.
